"Cases range from persons who grew back lost teeth to others whose crippling diseases spontaneously vanished," said Brad Steiger, author of the book UFO Abductors.
For 25 years, he's gathered hundreds of accounts from people around the world. Here are some of his most intriguing cases:
1) In the early 1980s, a farmer named Mrs. M saw her badly infected hand healed within minutes after her encounter with aliens, according to Steiger. Mrs. M's hand was swollen and oozing, and when she went to her doctor, he gave her antibiotics, bandaged the hand and said it would heal in about a month.
The next morning, she was in a field when she saw a luminous egg-shaped object approaching her.
"A door seemed to open in the craft and the next thing she knew, she was in a brilliantly lit room filled with high-tech equipment," said Steiger.
"Three small creatures surrounded her, each wearing a mask."
Mrs. M became unconscious during the examination, then woke back in the field - and she found her hand completely healed.
2) A toothless 80-year-old farmer from Brazil grew new teeth within two months after his abduction by four small men in a silver circular-shaped craft in 1978, according to Steiger.
The strange beings examined the man, then released him unharmed - and his first teeth appeared about two weeks later.
3) A man named Bertram had an enlarged liver since birth and was told it would never become normal, but he proved the doctors wrong after his encounter with a UFO.
Bertram was skiing down a remote slope in Finland a few years ago when he was caught in a white beam of light from an egg-shaped UFO.
The UFO left several minutes later.
When Bertram went for a physical after a few days, doctors found his liver had shrunk to normal size.
4) Wheelchair-bound Richard T overcame a nerve disease after his encounter with a UFO in 1982 in Michigan, said Steiger.
"One evening he was enjoying the solitude of a beach when a 100-foot-long torpedo-shaped UFO appeared above him. He entered a trance state and he and his wheelchair were somehow lifted into the craft.
"There, he was examined by aliens and the next thing he remembered, he was once again beside his van.
"Amazingly, over the coming week, his condition reversed itself. Finally, he was able to walk again."
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